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Scientists
This category is for questions about the people who apply the scientific method to solve problems, introduce new concepts, and strive to explain the natural world.
9,527 Questions
What is the gem containing ca ti Fe Mn cu Zn Rb Sr?
Lots of gems might contain those as minor impurities. You'd need to be significantly more specific.
What is the person called that studies Anthropology?
A person who studies Anthropology is called an anthropologist. They study human societies, cultures, and behaviors through research, fieldwork, and analysis.
What is value of 2004 dime where the 4 is so weak you can hardly see it with a magnifying glass?
Ten Cents. If the digit was completely missing you might have a "struck-through" error worth a dollar, but weakly struck elements reduce the numismatic value of a coin.
How was René Descartes an enlightenment thinker?
Questioning everything was the key to the enlightenment, and that is what he did. He even began doubting his own exsistance
What are the ways for a PS2 controller to work on a PS3?
If you go to Gamestop.com go to ps3 accsesories and you sholud see a ps2 to ps3 converter where you can plug a ps2 controller into a ps3's usb port on the front they are listed for $15.
Who are some famous dead scientists?
These are SOME Famous Dead Scientist;
Albert Einstein, Sir Issac Newton, Thomas Edison, and Alexander Graham Bell.
Linnaeus developed a system for naming and classifying organisms which is called?
Binomial nomenclature.
A man named Antonie van Leeuwenhoek at the turn of the 1700's.
Albert Einstein
What are René Descartes' contributions to the society?
Descartes created the Cartesian coordinates and the Cartesian curves and has often been given credit for analytical geometry.
he was a mathmatician
There are a few who claim the idea, but president Harry Truman first approved one to be built for the Korean war, 1950-1953. Richard Lawrence Garwin, American physicist, produced a design in 1952 at IBM Watson Laboratory at Columbia University.
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The original ideas for the hydrogen bomb came up early in the Manhattan Project, but it is unknown who first proposed them.
Edward Teller became fixated on the idea of the hydrogen bomb and the only way that Oppenheimer could get Teller to continue doing any work on the atomic bomb and stop taking other scientists away from their critical atomic bomb tasks to work on Teller's hydrogen bomb ideas was to just let him work on his hydrogen bomb ideas and just contact Teller as needed to consult on the atomic bomb work.
Edward Teller completed his first hydrogen bomb design, which he called "The Super" in the fall of 1945. This design was tested by numerical simulation on the newly completed ENIAC in december 1945 through january 1946, and shown to be not workable. Further work on hydrogen bomb designs was effectively suspended (although Edward Teller was allowed to continue "dabbling" at designing one).
In 1950 Stanislaw Ulam (a mathematician working with a team on producing higher yield more efficient atomic bombs) went to consult with Teller on an idea his team had proposed to use the explosion of one atomic bomb to compress and trigger a second atomic bomb. Teller suddenly realized this was the idea he needed to make his "Super" bombs work: use an atomic bomb not just to heat his hydrogen bomb (as he had done in all earlier designs) but to compress his hydrogen bomb too. Computer numerical simulations confirmed this would work. Serious design work on hydrogen bombs resumed at Los Alamos.
The first hydrogen bomb using the new "Teller-Ulam" design was built and tested in 1952, but by then Teller was fed up with his working arrangements at Los Alamos and quit. He convinced the military and AEC that they needed a second nuclear weapons development lab that he would have absolute control over. Slightly later in 1952 Lawrence Livermore Labs opened with Edward Teller as director.
Is Valerie Thomas black scientist dead?
There is no information available to suggest that Valerie Thomas, an African American scientist known for her contributions to NASA, has passed away. She is known for her work in developing the illusion transmitter, a technology that is used in the creation of 3D imaging.
A design of a typical steam boiler for electric power generation?
In a Power generating plant, steam is produced in a boiler. The boiler is effectively a huge kettle. Generally a boiler has the following subassembly layout: high pressure water flow (>200 bar g, >250 DEG C) enters the economizer inlet headers and then thru the economizer heat exchange pipes to arive in the economizer outlet headers. Main role of the economizer is heat up the water. After the economizer the water runs thru the headers and heat exchange pipes of the evaporator. Here the water vaporizes in to steam. Steam then runs through the headers and heat exchange pipes of generally 2 - 3 superheaters. Between superheaters and after the last superheater is a water injection point to control the temperature of the superheated steam.
This layout would be in case of drum boiler, used in small power plants (electric power output not more then 100MW). Now the drum is large barell on top of the boiler where water and steam are separated. In case of large MW rated power plants the boiled does not have a drum. I must also say that when a boiler has a drum it is called a multiple pass boiler. That means that water is circulated through the vaporizer in 2,3 or more cycles until is fully transformed in to steam. In case of large MW rated power plants water passes through the vaporizer only one time and is fully transformed in to steam. This type of boilers are called " once through" boilers or "Benson" type after the name of the inventor.
Now to have a view about the actual layout of the heat exchange surfaces here are some facts :
- furnace, wih burners, is place where the flame or fire is located. Here temperature is very high ( >900DEG C). Heat surfaces are superheaters. Main heat exchange is done through radiation. Professionals calls this heat exchanger as radiation superheater.
- convective superheaters. Called like this because heat exchange is particularly by convective means. The flue gases are cooler here and this is an array of pipes that the flue gases washes them. As I mentioned earlier it can be 2-3 convective superheaters.
Steam that comes out from superheaters is run through pipes to the turbine inlet valves. In large MW rated power plants, steam that comes out from the high pressure turbine body is reheated in the boiler. Reheaters are also heat exchange surfaces that are generally intercalated with the superheaters. After reheating the steam is run to the intermediate pressure turbine body.
To continue with the heat exchange surfaces layout in boiler, flue gases after washing the superheaters and/or reheaters will wash the evaporator and then the economizer before actually exiting the boiler body. To recover as much heat from the flue gases, after exiting the boiler, flue gases are run through a rotarry or tube heat exchanger. Here, air that is fed to the burners is heted. This way remanent heat of the flue gases is put back in to boiler making it more efficient.
So to summarize a boiler is made of ( in order of flue gases pass) :
- furnace (radiation superheater, pipes are run by high pressure steam)
- convective superheaters ( pipes are run by high pressure steam)
- evaporator (pipes are run by a mixture of water and steam)
- economizer ( pipes are run by water )
Unlike a huge kettle, modern boilers use tubes filled with water and steam. Contained within a furnace.
How Alexander Flemings work helped to prevent diseases caused by micro-organisms?
because now we have antibiotics
